Burundi Flag Pack 3D model is available on CGTrader for $39. Original author: dragosburian. Specs: 10000 polys, 10000 verts.
BLEND (Blender, filesize: 33.4 MB), OBJ (OBJ, filesize: 10.8 MB), FBX (Autodesk FBX, filesize: 54 MB), DAE (Collada, filesize: 12.1 MB), STL (Stereolithography, filesize: 3.12 MB)